I understand AT&T is a GSM carrier and I know if you jailbreak them and then unlock them you can use it for any GSM carrier and I understand Sprint and Verizon are CDMA carriers just to make sure I never got a true answer on this question but you cannot unlock a gsm phone for a cdma carrier correct and I already know since the updated phones you now can't jailbreak and unlock the Verizon iphones for Sprint or you will brick you device correct ?
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iPhone from AT&T unlock for Sprint ?
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